Interim Condensed Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total Dolby Laboratories,Inc.[Member]	Controlling Interest [Member]
Beginning balance at Sep. 26, 2014	$ 1,731,648	$ 103	$ 46,415	$ 1,660,485	$ 3,014	$ 1,710,017	$ 21,631
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	100,469			99,331		99,331	1,138
Translation adjustments, net of tax of $829 and $(64), respectively	(11,872)				(11,211)	(11,211)	(661)
Unrealized gains (losses) on available-for-sale securities, net of tax of $(327) and $(98), respectively	665				665	665
Distributions to controlling interest	(5,628)						(5,628)
Stock-based compensation expense	34,509		34,509			34,509
Repurchase of common stock	(32,364)	(1)	(32,363)			(32,364)
Cash dividends declared and paid on common stock	(20,470)			(20,470)		(20,470)
Tax benefit/(deficiency) from the stock incentive plans	1,273		1,273			1,273
Common stock issued under employee stock plans	12,631	1	12,630			12,631
Tax withholdings on vesting of restricted stock	(11,809)		(11,809)			(11,809)
Exercise of class B stock options	7		7			7
Ending balance at Mar. 27, 2015	1,799,059	103	50,662	1,739,346	(7,532)	1,782,579	16,480
Beginning balance at Sep. 25, 2015	1,816,007	102	17,571	1,800,857	(11,462)	1,807,068	8,939
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	98,556			98,299		98,299	257
Translation adjustments, net of tax of $829 and $(64), respectively	2,122				2,417	2,417	(295)
Unrealized gains (losses) on available-for-sale securities, net of tax of $(327) and $(98), respectively	703				703	703
Distributions to controlling interest	(214)			0		0	(214)
Stock-based compensation expense	35,466		35,466			35,466
Repurchase of common stock	(76,856)	(2)	(55,500)	(21,354)		(76,856)
Cash dividends declared and paid on common stock	(24,200)			(24,200)		(24,200)
Tax benefit/(deficiency) from the stock incentive plans	(1,369)		(1,369)			(1,369)
Common stock issued under employee stock plans	14,575	0	14,575			14,575
Tax withholdings on vesting of restricted stock	(10,742)	1	(10,743)			(10,742)
Ending balance at Apr. 01, 2016	$ 1,854,048	$ 101	$ 0	$ 1,853,602	$ (8,342)	$ 1,845,361	$ 8,687